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2022年英语专四听力dictation备考训练（97）

2021-11-24 17:38:00来源：网络

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　　Controlling Cancer

　　There are two main causes of cancer, heredity and environment. We can do

　　nothing to change our heredity, that is, the basic physical characteristics that

　　were passed on to us by our parents. However, we can do a great deal to control

　　our environment, which may account for 80%-90% of all cancers.

　　Environmental pollution can be divided into two kinds: personal and

　　nonpersonal. Personal pollution may be defined roughly as unhealthy habits such

　　as smoking, drinking, and eating the wrong foods. Clearly, with enough will

　　power we can control this personal environment.

　　Nonpersonal pollution, on the other hand, refers to those things which are

　　beyond our individual control. One example would be industrial pollution, which

　　is very hard to control because of the expense involved. It would be expensive

　　in terms of profits and perhaps jobs. The American automobile industry, for

　　example, resisted the law requiring smog-control devices because it feared the

　　added expense would reduce profits. Nevertheless, some laws protecting the

　　environment have been quite successful in reducing pollution.

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